<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->
    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="isLoading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->
      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->
        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!--
            模板中的 $event 是事件参数
            当我们传递给子组件的数据既要使用还要修改。
            传递：props
              :is-followed="article.is_followed"
            修改：自定义事件
              @update-is_followed="article.is_followed = $event"
            简写方式：在组件上使用 v-model（以下俩句代码是v-model的原理）
              :value="article.is_followed"
              @input="article.is_followed = $event"
            -->
          <FollowUser
            class="follow-btn"
            v-model="article.is_followed"
            :user-id="article.aut_id"
          >
          </FollowUser>
          <!-- 
            /* v-model 相当于以下操作 */
            <follow-user
                class="follow-btn"
                :value="article.is_followed"
                @input="article.is_followed = $event"
                :user-id="article.aut_id"
            ></follow-user>
           -->
          <!--注意： 如果是点击事件发生，那么$event就是鼠标事件对象
              如果是键盘事件发生，那么$event就是键盘事件对象
              如果是自定义事件发生，那么$event就是$emit触发事件时的参数
              将之前的俩按钮屏蔽掉，使用follow-user组件 -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          ref="article-content"
          v-html="article.content"
        ></div>
        <van-divider id="xxc">正文结束</van-divider>
        <CommentList
          :source="article.art_id"
          :list="commentList"
          @onload-success="totalCommentCount = $event.total_count"
          @reply="replaya"
        />

        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            :badge="totalCommentCount"
            type="default"
            round
            size="small"
            @click="isPostShow = true"
            >写评论</van-button
          >
          <van-icon
            name="comment-o"
            @click="getPinlun"
            :badge="totalCommentCount"
            color="#777"
          />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <CollectArticle
            class="btn-item"
            v-model="article.is_collected"
            :articleId="article.art_id"
          ></CollectArticle>
          <!-- <van-icon color="#777" name="good-job-o" /> -->
          <LikeArticle
            class="btn-item"
            v-model="article.attitude"
            :article-id="article.art_id"
          ></LikeArticle>
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
        <!-- 弹出//底部区域下方添加 -->

        <van-popup v-model="isPostShow" position="bottom">
          <CommentPost
            :target="article.art_id"
            @post-success="onPostSuccess"
          ></CommentPost>
        </van-popup>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
    <!-- 评论回复 -->
    <!--
      弹出层是懒渲染的：只有在第一次展示的时候才会渲染里面的内容，
      之后它的关闭和显示都是在切换内容的显示和隐藏,
      加上这个即可v-if="isReplyShow"
     -->
    <van-popup v-model="isReplyShow" position="bottom" style="height: 100%">
      <!--
        为啥加上v-if 条件渲染，因为调试控制台vue里面没有这个组件，直接隐藏
        所以绑定v-if，且它的绑定值是弹出层的绑定值
          true：渲染元素节点
          false：不渲染
       -->
      <CommentReply
        v-if="isReplyShow"
        @close="isReplyShow = false"
        :comment="currentComment"
      />
    </van-popup>
  </div>
</template>
<script>
import { getArticleById } from "@/api/article.js";
import { ImagePreview } from "vant";
import FollowUser from "@/components/follow-user";
import CollectArticle from "@/components/collect-article";
import LikeArticle from "@/components/like-article";
// import CommentList from './components/comment-list'
import CommentList from "@/views/article/components/comment-list";
import CommentPost from "./components/comment-post";
import CommentReply from "./components/comment-reply";
export default {
  name: "ArticleIndex",
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    CommentReply,
  },
  props: {
    articleId: {
      type: [Number, String],
      required: true,
    },
  },
  data() {
    return {
      article: {}, // 文章详情
      errStatus: "",
      isLoading: true,
      followLoading: false,
      totalCommentCount: 0,
      isReplyShow: false, //回复弹出
      isPostShow: false,
      commentList: [],
      currentComment: {}, // // 当前点击回复的评论项
    };
  },
  // 给所有的后代组件提供数据
  // 注意：不要滥用
  provide: function () {
    return {
      articleId: this.articleId,
    };
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle();
  },
  mounted() {},
  methods: {
    async loadArticle() {
      try {
        //  if (Math.random() > 0.5) {
        //         return JSON.parse('error')
        //     }
        // 当点击重试，但是已经设置为false，故需要手动进行true
        this.isLoading = true;
        const { data } = await getArticleById(this.articleId);
        console.log("详情" + data.data);
        this.article = data.data;
        // 打印不出，为啥，因为前面需要条件渲染，异步
        //  console.log(this.$refs['article-content'])
        setTimeout(() => {
          // 视图更新是异步，settime也是异步，按顺序执行
          // console.log(this.$refs['article-content'])
          this.getImages();
        }, 0);
      } catch (err) {
        console.log(err);
        if (err.response && err.response.status === 404) {
          this.errStatus = 404;
        }
        this.$toast("获取数据失败");
      }
      this.isLoading = false;
    },
    getImages() {
      const arra = this.$refs["article-content"];
      console.log("hhhh" + arra);
      const imgs = arra.querySelectorAll("img");

      const images = [];
      imgs.forEach((e, i) => {
        images.push(e.src);
        e.onclick = () => {
          ImagePreview({
            images,
            startPosition: 0,
          });
        };
      });
    },
    onPostSuccess(data) {
      this.isPostShow = false;
      this.commentList.unshift(data.new_obj);
    },
    replaya(comment) {
      console.log(comment);
      this.currentComment = comment;
      this.isReplyShow = true;
    },
    getPinlun() {
      document.getElementById("xxc").scrollIntoView({
        behavior: "smooth", // 平滑过渡
        block: "start", // 上边框与视窗顶部平齐。默认值
      });
    },
  },
};
</script>

<style scoped lang="less">
@import "./github-markdown.css";

.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: #fff;
  }
  .article-detail {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    /deep/ .van-icon {
      font-size: 40px;
    }
    .comment-icon {
      top: 2px;
      color: #777;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
    .btn-item {
      border: none;
      padding: 0;
      height: 40px;
      line-height: 40px;
      color: #777777;
    }
    .collect-btn--collected {
      color: #ffa500;
    }
    .like-btn--liked {
      color: #e5645f;
    }
  }
}
</style>